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Convertible Senior Notes (Details)	1 Months Ended			6 Months Ended
	Apr. 30, 2019 USD ($) $ / shares shares	Mar. 31, 2019 USD ($)	Apr. 30, 2018 USD ($) day $ / shares shares	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Net proceeds				$ 0	$ 780,180,000
Senior Notes | 0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Face value	$ 100,000,000	$ 700,000,000		$ 800,000,000		$ 800,000,000
Interest rate, stated percentage		0.125%
Proceeds from issuance of debt	800,000,000
Less initial purchasers’ discount	(18,998,000)
Less other issuance costs	(822,000)
Net proceeds	$ 780,180,000
Conversion price | $ / shares	$ 51.56
Debt instrument, remaining useful life				4 years 8 months 12 days
Share price (in dollars per share) | $ / shares				$ 67.26
Debt conversion, converted instrument, amount				$ 1,043,600,000
Debt instrument, if-converted value less than principal				243,600,000
Interest rate, effective percentage	5.40%
Senior Notes | 0.125% Convertible Senior Notes Due 2025 | Capped Call
Debt Instrument [Line Items]
Net proceeds	$ 97,200,000
Conversion price | $ / shares	$ 79.32
Debt instrument, convertible (in shares) | shares	15,516,480
Senior Notes | 0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Face value			$ 345,000,000	$ 344,998,000		$ 345,000,000
Interest rate, stated percentage			0.25%
Proceeds from issuance of debt			$ 345,000,000
Less initial purchasers’ discount			(8,625,000)
Less other issuance costs			(757,000)
Net proceeds			335,618,000
Option to purchase additional notes			$ 45,000,000
Conversion ratio		0.0193956	0.0371051
Conversion price | $ / shares			$ 26.95
Debt instrument, remaining useful life				2 years 10 months 24 days
Debt conversion, converted instrument, amount				$ 861,000,000.0
Debt instrument, if-converted value in excess of principal				$ 516,000,000.0
Interest rate, effective percentage			4.34%
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Sale Price Is Greater Or Equal 130%
Debt Instrument [Line Items]
Threshold trading days | day			20
Threshold consecutive trading days | day			30
Threshold percentage of stock price trigger			130.00%
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Trading Price Per $1,000 Principal Amount Less Than 98%
Debt Instrument [Line Items]
Threshold trading days | day			5
Threshold consecutive trading days | day			10
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Trading Price Per $1,000 Principal Amount Less Than 98% | Maximum
Debt Instrument [Line Items]
Threshold percentage of stock price trigger			98.00%
Senior Notes | 0.25% Convertible Senior Notes Due 2023 | Capped Call
Debt Instrument [Line Items]
Net proceeds			$ 39,200,000
Conversion price | $ / shares			$ 40.68
Debt instrument, convertible (in shares) | shares			12,801,185

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